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<?php $default = array('GBP','USD'); $currencies = null; if ( ! is_array($currencies) ) $currencies = array($currencies); $c = array_merge($currencies, $default); var_dump(array_unique($c));
Output for 4.3.0 - 7.1.0
array(3) { [0]=> NULL [1]=> string(3) "GBP" [2]=> string(3) "USD" }